
The Canadian IBP stamp , issued on February 18, 1970, shows a microscopic view of a leaf.

National Archives of Canada
First Day Covers
Canada Post Office Publicity First Day Cover

Schering Corporation


Canada Envelope Company


Jackson

Overseas Mailers

H & E

David Pritchard

Ayerst Laboratory


Rosecraft



Usages
Domestic Letter

Toronto, March 11, 1970
6 cents domestic letter rate